If the saddle causes you pain when you get OFF it, it's quite likely the saddle is too narrow (to the point you aren't even weightbearing at all where you should) and the pain you are feeling is the rebound of your pelvic bones and tissues.
You could also be sitting on the narrow portion of the saddle too much.
I own a couple Velos (they came with the bikes). My vote is that they are too narrow over all for my particular butt.
They might be too narrow for your butt, too.
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